OTW-10SS Technical Performance Data Sheet

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Compatibility Conclusions: OTW 10SS

After rewelding with OTW 10SS over the 7 welded hardbanding alloys, all the hardbanding overlay is examined visually for cracks and then cut and polished to study the interface between the new and old hardbanding products. There should be a smooth transition with no crack formation and the micrographs of transition zone between different alloys and OTW 10SS are recorded and studied. OTW 10SS has been shown to be not only fully compatible (interchangeable) with itself, but also with the other products in the OTW range, OTW16 XS, OTW12 Ti and OTW13 CF plus the most commonly used hardbanding alloys available in the market today.

Non-Cracking Design (NCD)

Most hardbanding products have a high hardness and different thermal expansion coefficient to that of the tool joint material that they are welded to. These mechanical differences plus the thermal stress created during welding results in high tensile stresses in the hardbanding layer, which are usually relieved by controlled cracking of hardbanding. The OTW range are all Non-Cracking Designed alloys. Not only this NCD feature give advantages in reducing casing wear, but when OTW 10SS is used it can save up to 75% of re-application costs compared to when using commercial products that are cracking. The table below demonstrates the reduction in the number of processes required with its consequential significant cost reduction. OTW 10SS is designed to be crack free on tool-joints, this has been done for over 6 years and with continuous success when the welding procedure in the OTW Hardbanding Application Manual is followed.